Bärbel Hahn-Hägerdal

TL;DR: In this paper, the production of l -lactic acid by Lactococcus lactis (ATCC 19435) during fermentation in an aqueous two-phase system (ATPS) was monitored on-line using microdialysis sampling coupled to a dual flow-through electrochemical cell housing glucose and lactate biosensors, which enabled the simultaneous and selective monitoring of both glucose and l - lactic acid.

TL;DR: Under anaerobic conditions the volumetric xylitol productivity increased with decreasing HRT with both strains and under oxygen limited conditions the effect of the recycling ratio on production parameters was masked by other factors, such as an accumulation of free cells in the bioreactor and severe genetic instability of the high XR strain.

TL;DR: The maximum growth rate of Saccharomyces cerevisiae ATCC 96581, adapted to fermentation of spent sulphite liquor, was 7 times higher in SSL of hardwood than the maximum growth rates of bakers' yeast.

TL;DR: The influence of aeration, pH, enzyme concentration, cell mass and the concentration of the respiratory inhibitor sodium azide on the production of ethanol and the formation of by-products was investigated.

TL;DR: The amount of fresh water used and the amount of waste water thereby produced in the production of fuel ethanol from softwood, can be reduced to a large extent by recycling of either the stillage stream or part of the liquid stream from the fermenter.